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TRUSTED BY SAMMAMISH, WA HOMEOWNERS

  • Average homeowner rating star icon4.8
    Average homeowner rating
  • Verified reviews icon23
    Verified earthquake retrofitting services reviews

Verified Reviews for Earthquake Retrofitting pros in Sammamish, WA

*The Angi rating for Earthquake Retrofitting companies in Sammamish, WA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Earthquake Retrofitting needs.

*The HomeAdvisor rating for Earthquake Retrofitting companies in Sammamish, WA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Earthquake Retrofitting needs.

Last update on December 24, 2025

Find Earthquake retrofitting specialists in Sammamish

Avatar for Stronghome Seismic, Inc.

Stronghome Seismic, Inc.

4.98(
48
)
•Approved Pro

Stronghome Seismic, Inc.

4.98(
48
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
6 years of experience

We are a family owned local buisness specializing in home earthquake retrofits. Our goal is to make sure that every family in the Seattle area is earthquake ready. We go through the most rigorous inspection process of our competitors and offer a "job done right' gaurantee. Your home is your biggest investment, know that it and your family are protected, call today for a free no obligation home inspection! (206) 245-5045

"James was an absolute pleasure to work with. We hired him to do earthquake retrofit for our home. He was very kind and answered all the millions of questions we had. Extremely professional and flexible.. I would highly recommend him."

Nathalie S on February 2024

We are a family owned local buisness specializing in home earthquake retrofits. Our goal is to make sure that every family in the Seattle area is earthquake ready. We go through the most rigorous inspection process of our competitors and offer a "job done right' gaurantee. Your home is your biggest investment, know that it and your family are protected, call today for a free no obligation home inspection! (206) 245-5045

"James was an absolute pleasure to work with. We hired him to do earthquake retrofit for our home. He was very kind and answered all the millions of questions we had. Extremely professional and flexible.. I would highly recommend him."

Nathalie S on February 2024

Avatar for TerraFirma Foundation Systems

TerraFirma Foundation Systems

4.51(
67
)
•Approved Pro

TerraFirma Foundation Systems

4.51(
67
)
•Approved Pro
Customers say: Quick response
20 years of experience
Free onsite estimate

Thousands of NW homeowners have trusted TerraFirma Foundation Systems to keep their homes safe, dry and stable since 2005. Nearly half of our business comes from referrals or repeat customers. We can help you too! TerraFirma is the NW expert in home foundations, basement and crawl space waterproofing, concrete leveling, and wall stabilization.

"Had a sump pump installed. Haven’t had a repeat of the problem."

Edward H on December 2025

Thousands of NW homeowners have trusted TerraFirma Foundation Systems to keep their homes safe, dry and stable since 2005. Nearly half of our business comes from referrals or repeat customers. We can help you too! TerraFirma is the NW expert in home foundations, basement and crawl space waterproofing, concrete leveling, and wall stabilization.

"Had a sump pump installed. Haven’t had a repeat of the problem."

Edward H on December 2025

Avatar for A-FFIX

A-FFIX

New on AngiNew on Angi
•Approved Pro

A-FFIX

New on AngiNew on Angi
•Approved Pro
35 years of experience
Free onsite estimate

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job. We have consistently focused on the needs of our customers, providing personalized attention and a stress-free experience.

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job. We have consistently focused on the needs of our customers, providing personalized attention and a stress-free experience.

Avatar for ESG Design

ESG Design

4.89(
75
)

ESG Design

4.89(
75
)
Customers say: Quality work
Recommended by 98% of Angi customers
Recommended by 98% of HomeAdvisor customers

ESG Design is your source for licensed professional structural engineering services. At ESG Design, our goal is to provide our clients with expert advise, professional service, and the highest quality Engineering and Architectural design work. We are a local small business focused on the unique needs of each customer and your specific project. Whether you are looking for preliminary design feasibility advice, standard construction plans engineering, or detailed structural performance analysis, ESG Design is here to support you. Email us at: [email protected]

"The communication was excellent! I really felt comfortable working with Eli and ESG. He went the extra mile to ensure my questions were answered. I would definitely hire ESG again."

Seth G on January 2022

ESG Design is your source for licensed professional structural engineering services. At ESG Design, our goal is to provide our clients with expert advise, professional service, and the highest quality Engineering and Architectural design work. We are a local small business focused on the unique needs of each customer and your specific project. Whether you are looking for preliminary design feasibility advice, standard construction plans engineering, or detailed structural performance analysis, ESG Design is here to support you. Email us at: [email protected]

"The communication was excellent! I really felt comfortable working with Eli and ESG. He went the extra mile to ensure my questions were answered. I would definitely hire ESG again."

Seth G on January 2022

Avatar for Evergreen Seismic

Evergreen Seismic

5.00(
34
)

Evergreen Seismic

5.00(
34
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

Evergreen Seismic, LLC is the Puget Sound's most trustworthy residential earthquake retrofit contractor. Our mission is to provide the highest quality of service, along with the most affordable prices. We take great pride in our work, and customer safety and satisfaction is our number one goal. Our clients demand and deserve excellence and we are committed to meet these expectations each and every time. We offer the experience of hundreds of retrofit installations, along with the highest quality products, valuable design and engineering, and stellar results.

"Matt made the whole process easy. My earthquake retrofit was completed without even entering my home. While they were in there, they spotted a few issues with my foundation, and were able to fix them with just one more day of work. All I had to do was say yes. Above and beyond work."

Josh J on November 2025

Evergreen Seismic, LLC is the Puget Sound's most trustworthy residential earthquake retrofit contractor. Our mission is to provide the highest quality of service, along with the most affordable prices. We take great pride in our work, and customer safety and satisfaction is our number one goal. Our clients demand and deserve excellence and we are committed to meet these expectations each and every time. We offer the experience of hundreds of retrofit installations, along with the highest quality products, valuable design and engineering, and stellar results.

"Matt made the whole process easy. My earthquake retrofit was completed without even entering my home. While they were in there, they spotted a few issues with my foundation, and were able to fix them with just one more day of work. All I had to do was say yes. Above and beyond work."

Josh J on November 2025

Girlfriends Estate Sales and Service LLC

5.00(
14
)

Girlfriends Estate Sales and Service LLC

5.00(
14
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

We hold estate/moving sales on premise at your location. We can do consignments. I have a number of freelance workers who have worked with me for years. We are registered with the State of Washington and the Department of Revenue in our state. We offer one free consultation up to one hour. You read more about us or review our sales on line on our website at: WWW.GirlfriendsEstateSales.com. Our primary goal is to provide outstanding professional service to the client who has hired us! Our commitment is to provide you with a professional liquidation and to help eliminate any of the unwanted stress normally associated with such situations. As we come into your lives, we will do so responsibly so as to always be a positive example which is right, just, and honest. Our expertise and attention to detail along with our honesty and integrity fosters our dedication to our clients and customers.

"Excellently. They priced everything that was in the house after I moved out. Although they did not sell everything, they sold more than I thought was possible. Afterward, they gave us 60% of the proceeds or more than $4,000.00."

Barbara S on April 2019

We hold estate/moving sales on premise at your location. We can do consignments. I have a number of freelance workers who have worked with me for years. We are registered with the State of Washington and the Department of Revenue in our state. We offer one free consultation up to one hour. You read more about us or review our sales on line on our website at: WWW.GirlfriendsEstateSales.com. Our primary goal is to provide outstanding professional service to the client who has hired us! Our commitment is to provide you with a professional liquidation and to help eliminate any of the unwanted stress normally associated with such situations. As we come into your lives, we will do so responsibly so as to always be a positive example which is right, just, and honest. Our expertise and attention to detail along with our honesty and integrity fosters our dedication to our clients and customers.

"Excellently. They priced everything that was in the house after I moved out. Although they did not sell everything, they sold more than I thought was possible. Afterward, they gave us 60% of the proceeds or more than $4,000.00."

Barbara S on April 2019

Cobalt Construction

5.00(
14
)

Cobalt Construction

5.00(
14
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

3 employees. Uses subs. Cost is determined by job. No travel charge.

"It went excellent and they were responsive on the neighboorhood that affected. Communication of the company is excellent."

Mack M on October 2022

3 employees. Uses subs. Cost is determined by job. No travel charge.

"It went excellent and they were responsive on the neighboorhood that affected. Communication of the company is excellent."

Mack M on October 2022

WESTERN CONSTRUCTION SYSTEMS

4.85(
26
)

WESTERN CONSTRUCTION SYSTEMS

4.85(
26
)
Customers say: Quality work
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers

Not a franchise, Family owned and operated since 1987. CCB# 94222, Serving the entire NW. FREE Estimates/ Inspections. Western Construction Systems LLC. is a locally owned, family owned and operated specialty construction company serving the entire north-west. WCS LLC. Prides its self in high quality work which is micro-managed by highly trained crews to ensure the highest level of confidant work. WCS LLC. Has also worked internationally in South America and currently has crews in Haiti. We have worked as far south as El Salvador and as far north as Alaska. We are able to attend to small residential job as well as large industrial projects.

"Western Construction Systems came out and did exceptional work at my house! They went above and beyond my expectations! They were friendly, professional, and hard-working! They took care of all the issues that I had concerns with and then some! Their prices were fair, especially for the high quality of work that they did! I know I pestered them with questions, but they were patient every single time. Before I contacted them to have the work done, I had high anxiety about the drainage issues. When they were finished, I felt confident that there were no more issues. Peace of mind is priceless!"

Robyn S on August 2022

Not a franchise, Family owned and operated since 1987. CCB# 94222, Serving the entire NW. FREE Estimates/ Inspections. Western Construction Systems LLC. is a locally owned, family owned and operated specialty construction company serving the entire north-west. WCS LLC. Prides its self in high quality work which is micro-managed by highly trained crews to ensure the highest level of confidant work. WCS LLC. Has also worked internationally in South America and currently has crews in Haiti. We have worked as far south as El Salvador and as far north as Alaska. We are able to attend to small residential job as well as large industrial projects.

"Western Construction Systems came out and did exceptional work at my house! They went above and beyond my expectations! They were friendly, professional, and hard-working! They took care of all the issues that I had concerns with and then some! Their prices were fair, especially for the high quality of work that they did! I know I pestered them with questions, but they were patient every single time. Before I contacted them to have the work done, I had high anxiety about the drainage issues. When they were finished, I felt confident that there were no more issues. Peace of mind is priceless!"

Robyn S on August 2022

Avatar for A-FFIX LLC

A-FFIX LLC

4.73(
37
)

A-FFIX LLC

4.73(
37
)
Customers say: True professional
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers

A-FFIX is a Seattle-based earthquake retrofit contractor specializing in home earthquake retrofit and seismic preparedness. We pride ourselves on being the most experienced, most knowledgeable earthquake retrofitter in the region, with the highest commitment to quality and customer security. - Founded in 1999 - twenty years in the business. - Experienced with all kinds of houses, small commercial buildings, and foundations. - Trusted in the community – awarded by City of Seattle, educator for Seattle Emergency Management, Phinney Ridge Community Center & others. As a small family business, A-FFIX puts customers and quality first. All jobs are overseen by founder Bruce Schoonmaker and foreman Martin Schoonmaker. We are insured, bonded, and licensed in the state of Washington under license number AFFIXL*015KS.

"Bruce, Martin, and Jerry were a fantastic team to work with on our home seismic retrofitting project! They showed up on-time and were prompt to answer and address our questions. We are very happy with the results and appreciate the help we received along the way. We consider A-FFIX to be top of our list for seismic retrofits here in the PNW!"

Cody G on October 2024

A-FFIX is a Seattle-based earthquake retrofit contractor specializing in home earthquake retrofit and seismic preparedness. We pride ourselves on being the most experienced, most knowledgeable earthquake retrofitter in the region, with the highest commitment to quality and customer security. - Founded in 1999 - twenty years in the business. - Experienced with all kinds of houses, small commercial buildings, and foundations. - Trusted in the community – awarded by City of Seattle, educator for Seattle Emergency Management, Phinney Ridge Community Center & others. As a small family business, A-FFIX puts customers and quality first. All jobs are overseen by founder Bruce Schoonmaker and foreman Martin Schoonmaker. We are insured, bonded, and licensed in the state of Washington under license number AFFIXL*015KS.

"Bruce, Martin, and Jerry were a fantastic team to work with on our home seismic retrofitting project! They showed up on-time and were prompt to answer and address our questions. We are very happy with the results and appreciate the help we received along the way. We consider A-FFIX to be top of our list for seismic retrofits here in the PNW!"

Cody G on October 2024

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Earthquake Retrofitting questions, answered by experts

Many homeowners want to know whether earthquake retrofitting is tax deductible. Because it’s often considered a capital improvement, you usually can’t deduct it. In some cases and locations, you may qualify for tax incentives, but you’ll need to talk to a tax professional or the Internal Revenue Service (IRS) about your specific circumstances. You may also be able to find grant money for seismic upgrades, which can lower the cost of your insurance premiums and save money over time.

Costs vary as much as timelines. The average earthquake retrofit costs between $3,500 and $8,700. However, homes on hillsides, large homes, and those with rooms over garages can cost up to $12,000 or more. Make sure to get a few estimates to compare the cost and services.

Almost all new buildings in California need an earthquake shut-off valve. The requirements for an earthquake gas shut-off valve (and who can install it) depend on where you live. For example, according to the Los Angeles Municipal Code, you’re required to hire a licensed contractor to install one whenever you build, sell, or renovate a home. Check with your local building department for your city’s laws on installing, permitting, and inspecting earthquake shut-off valves.

Ensure proper ventilation, fix leaks, and schedule regular pest inspections to protect your property.

Projects will vary based on size and scope, but an average earthquake retrofit takes between two weeks and two months. This includes the initial evaluation and plan, bidding and contract paperwork, permitting and approval process, actual work, and final inspection. Your contractor should give you a more accurate time estimate for your specific project, and they may be able to estimate how long the permitting process will take for your area.

The Sammamish, WA homeowners’ guide to earthquake retrofitting services

From average costs to expert advice, get all the answers you need to get your job done.

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